A Victorian "piano or organ" lamp from the 1880's has adjustable height to use when reading music at an instrument. Originally oil or kerosene burning, it has been rewired for electricity, there is a switch on the oil font.
Solid brass with nice antique patina, the genuine onyx table has been polished and sealed to resist stains. The 10" diameter cut and etched ball shade is antique but not original to this American made light.
A set screw adjusts the spiral column from 68" to 90" tall. Table diameter is 16" and legs are 20" across.
See 25 photos on Harp Gallery website that enlarge to full screen size.